CADW (CADW) Geophysical Survey WESSEX5: (17/Apr/2010 to 02/May/2010)
Simple
- Date (Publication)
- 2010-05-02
- Identifier
- British Geological Survey / BGS_CMD_REF657
+44 (0)131 668 4140
- Maintenance and update frequency
- notPlanned Not planned
- Keywords
- GEMET - INSPIRE themes, version 1.0
- SeaVoX Vertical Co-ordinate Coverages (L131)
- SeaDataNet Parameter Discovery Vocabulary (P021)
- Access constraints
- otherRestrictions Other restrictions
- Access constraints
- otherRestrictions No restrictions, a copyright acknowledgement is required and permission from any third party for the release of the data has been obtained. Inclusion of any third party data will determine the copyright acknowledgement that needs to be made.
- Use constraints
- otherRestrictions Other restrictions
- Other constraints
- The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
- Use limitation
- unrestricted use, copyright acknowledgement - Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced Cadw materials "Contains Cadw materials ©Crown Copyright [year]"
- Spatial representation type
- grid Grid
- Distance
- 5 urn:ogc:def:uom:EPSG::9001
- Metadata language
- EnglishEnglish
- Topic category
-
- Geoscientific information
- Geographic identifier
-
Lundy
- Date (Revision)
- 2024-04-21
- Geographic identifier
-
Cardigan Bay
- Date (Revision)
- 2024-04-21
- Geographic identifier
-
Western Channel & Celtic Sea
- Date (Creation)
- 2009-06-18
- Geographic identifier
-
Irish Sea
- Date (Creation)
- 2009-06-18
- Geographic identifier
-
CELTIC SEA
- Date (Creation)
- 1954-01-01
- Geographic identifier
-
IRISH SEA
- Date (Creation)
- 1954-01-01
- Begin date
- 2010-04-17
- End date
- 2010-05-02
- Reference system identifier
-
OGP
/
urn:ogc:def:crs:EPSG::4326
- Date (Revision)
- 2005
- Distribution format
-
+44 (0)131 668 4140
- OnLine resource
-
BGS Offshore Geoindex
(
HTTP
)
GeoIndex allows users to search for information about BGS data collections covering the UK and other areas world wide. Access is free, the interface is easy to use, and it has been developed to enable users to check coverage of different types of data and find out some background information about the data. More detailed information can be obtained by further enquiry through the website.
- Hierarchy level
- dataset Dataset
Conformance result
- Date (Publication)
- 2011
- Explanation
- See the referenced specification
- Pass
- No
- Statement
- Geophysical equipment types used included: Magnetometer and Sidescan Sonar. Wessex Archaeology was contracted to undertake the survey on behalf of CADW. Positions were provided using Leica 500 Trimble RTK beacon receiving corrections via satellite or a Trimble DGPS, which received differential corrections via land stations to provide a position to within 0.6m. Positions were recorded using World Geodetic System 1984 (WGS84) Datum and projected as Universal Transverse Mercator (UTM) Zone 30 North co-ordinates. The navigation data were recorded using Hypack (2008 v.2). The sidescan sonar data were acquired with a Klein 3900 towfish system. This system uses the latest technology in digital sidescan sonar imaging and can operate at either low (445kHz) or high (900kHz) frequency to provide high resolution images. The data were digitally recorded in xtf format using SonarPro Software. The sidescan sonar towfish layback values were recorded on survey logs and also applied to the raw data in SonarPro as it was recorded. The magnetic gradiometer data were acquired using Geomatrix’s G882 gradiometer system consisting of two marine caesium vapour magnetometers arranged horizontally 1.5m apart on a transverse gradiometer tow frame. The gradiometer frame was deployed independently of the sidescan sonar system, permitting the separate adjustment of fish heights. A fin and lead weight positioned under the centre of the frame were used in addition to those attached to each of the magnetometers in order to aid the submersion and stability of the gradiometer. This system was chosen for its high performance in shallow water with high sensitivity and fast sampling rate with a resolution of 0.02nT at 0.1 second sample interval and an absolute accuracy of <3nT throughout the range. The system only suffers a heading error of +/- 1nT error through a 360° arc. The gradiometer data were recorded in Geomatrix software Maglog and exported into ASCII files in real-time, where the raw and corrected position, field value, altitude and depth for each of the magnetometers were recorded in a single string. All magnetometer layback values were applied to the raw data in Maglog during recording and detailed on survey logs. In cases where the layback calculation failed the gradiometer data were corrected during the processing stages.
- File identifier
- c5bc60cd-04eb-3862-e044-0003ba9b0d97 XML
- Metadata language
- EnglishEnglish
- Hierarchy level
- dataset Dataset
- Date stamp
- 2024-04-21
- Metadata standard name
- MEDIN Discovery Metadata Standard
- Metadata standard version
- Version 2.3.5
+44 (0)131 668 4140